Seat assembly for ball valves

Details Seat assembly for ball valves Seat assembly for ball valves

1979-09-21

1981-09-22

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251174, 251362, 251368, F16K 2500

Patent

active

042905818

ABSTRACT:
A ball valve having a seat assembly (46) in the form of a flexible metal holder (52) which carries a resin impregnated graphite face seal (54) contacting the ball (28). Flexibility of the holder is provided by a leg (58) thereof which terminates in a free end having an annular lip (62) in sealing contact with the valve body. In a modified arrangement, the upstream seat has an annular space exposed to the upstream flow passage in order to increase the sealing force, while a corresponding annular space of the downstream seat is exposed to the valve chamber to increase its sealing force when the body pressure exceeds the downstream pressure.

REFERENCES:
patent: 2777664 (1957-01-01), Bryant
patent: 3073566 (1963-01-01), Bredtschneider
patent: 3266769 (1966-08-01), Shand
patent: 3460843 (1969-08-01), Jaeger
patent: 3472270 (1969-10-01), Masheder
patent: 3511471 (1970-05-01), Rossi
patent: 3521855 (1970-07-01), Jensen
patent: 3559662 (1971-02-01), Iezzi
patent: 3842861 (1974-10-01), Jandrasi
patent: 3945607 (1976-03-01), Dashner

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